Automatic spring-piston for liquid, steam, or gas cylinders.



W. M. RUMSEY. AUTOMATIC SPRING PISTON FOB. LIQUID, STEAM, 0R GAS CYLINDERS.

APPLICATION FILED MAY 15, I908. v I

Patented Apr. 13, 1909.

WITNESSES INVENTOR William Mflwnsey.

ATTORNEY UNITED STATES PATENT OFFICE;

WILLIAM MILO RUMsEh-oEsA DIEGO, CALIFORNIA.

AUTOMATIC srnnvc-prs'ron FOR LIQUID, STEAM, on GAS CYLINDERS.

I Specification of Letters Patent.

Patented April s, 1909.

Application filed M23115, 190's. Serial No. 433,129.

To alt'whom itmioy concern: Be it known that I, WILLIAM MILQRUM- say, a citizen of the United States, residentof San Diego, in the county of San Diego, State of California, have invented a new and useful Automatic .3 ring-Piston for Li uid, Steam, or Gas Cylin ers, of which the fol owing is a s ecification. V The 0 ject of'my improvements is to provide an economically constructed automatic piston which will act upon its own pressureto relieve itselfiat a raduated high point of pressure and avoid t e blowing out-of a cyl- Inder head, or injuring the cylinder by unusual strain. I attain these objects by the mechanism illustrated in the accompanyin drawings, in which i'gure 1 is a vertical "sectional view of a cylinder complete, used for the purpose of compressing gas or air said section being taken'u on line.1 1 of Fig. 3. Fig. 2 is a sectiona viewof the cylinder head, showing one method or form of construction for this class of cylinders, cut in two on line 22. Fig. 3' is a plan view of the cylinder with the head removed, and Fig-.4 is a sectional view .upon the two planes indicated by line 44 and atri ht an Ice to said line,

i A is t e wa s of the cylinder. B is the head of the cylinder which forms the outside inclosurev of this method of construction of a cylinder for a compressor.

' C is a ring in head B to lift it from the cylinder. 1

D is the inner head of the cylinder.

E is a plate, which contains the valve F that is attached to the inner head D, said valve being provided with a spring G that holds itinto the valve seat, and operates the valve. Said head E-is fastened to art 1) by screws N. L is stud bolts which asten the outer-head B to the cylinderA and is provided at the joint with a gasket K to prevent leakage. The innerhead D is constructed to rest between the outer head B and upon the end of the cylinder, and is held in position'by screws M. Y O is the upper section of piston.

'P'is the lower section-of the shell of the piston, andis provided with piston rings Q. The lower section of the piston is connected to the-end of the piston rod X by a solid key, whichholds it firm in position. The upper section 0 of the iston is'intended to work loose-over the en of the piston. rod, and is the shell a the -which enters the first named provided with jam nuts (1, that hold the upper section 0 firmly .to spring Z. Said spring is intended to allow the upper section of the piston to yield in heavy pressure and bring the upper point of the piston rod in connectionwith a rod or pin on valve S which forces the valve'open and allows the pressure to escape back to the'suction side of the cylinder.

are closed, and not blow a cylinder head out.

U is a collar with anannular groove thatworks in connection with a web form inner head R which contains the valve seat that receives the valve S which rests upon s ring V and has port holes I) through whic the ases escape. The annular-grooved collar. eing made fast to the stem of valve S, and secured'by jam nut'W. which prevents 'it from working loose and works free in the rim of the inner head section R, with a play or sufficient space to allow the valve to open high compression Inenough to relieve a stantaneously.

In this manner the piston may...-.66'

continue in motion while the discharge valves n is a water space for cooling purposes of] the compressor cylinder, which 1s only shown for illustration in the method of construction,

his a wooden jacket which forms theblitside of the cylinder, and is added to the cylinderfor a finish only.

compressor cylin er.

g is a supply pi e for water for cooling the r gis a .suctlon pipe of the com 'ressorthrou h which the gases are admitte to the ii' h b I pist' epac in t e stufling ox. m is an oil pipe, to the stuffing box.

is is a lantern gland which separates the packing in the stufling box'of the piston'rodinclosure, and to accumulate. 1

{is a stufiing box gland. v

I claim to be-newand desire to-protect by Letters Patent, is:

Wing thus described y invention, Whatprovides'an open space for oil h 1. Ina device ofthecharacter'described, I

the slidable portionof the piston and deending into said portion there being a seat which normally tends to force said valve away from its seat, a valve stem upon which said valve is mounted, said valve stem being located in longitudinal alin'ement with the inner end of the piston rod, there being ports formed through the valve carryin 'member and through both the fixed an slidable portions of the piston, substantially as shown and described. I

2. In a devioe' of the character described, the combination with a piston rod, of a twopart iston, one part of said iston being cup-l1 e in form and beingrigid y secured to the piston rod, the other part of said piston being hollow and having a reduced portion which enters the first named lastnamed portion being slida 1y disposed upon the piston rod, a spring interposed beortion, said tween the fixed and-the slidable'portion of the iston, a valve carryin member carried 25 by t eslidable portion of-t e piston and de ending into said portion,-there being a seat ormed in said part, a valve adapted to rest upon said seat, a'spring disposed between said valve and the valve carrying member formed throughthe valve'earry 5 member and through both the fixed and sli able ortions of the pistonpa. groovedeollal in w 'ch saidvalve'stem is shdablydis osed -and a nut which holdssaid groove" collar upon 40 30 which normally tendsto. force said valve away from its seat, a valve sternuponwhich said valve is mounted, said valve stem being located in longitudinal alinement" with the inner end of the piston rod,- there being ports 5 

